1 /* 2 * linux/drivers/acorn/scsi/fas216.c 3 * 4 * Copyright (C) 1997-2003 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and 11 * other sources, including: 12 * the AMD Am53CF94 data sheet 13 * the AMD Am53C94 data sheet 14 * 15 * This is a generic driver. To use it, have a look at cumana_2.c. You 16 * should define your own structure that overlays FAS216_Info, eg: 17 * struct my_host_data { 18 * FAS216_Info info; 19 * ... my host specific data ... 20 * }; 21 * 22 * Changelog: 23 * 30-08-1997 RMK Created 24 * 14-09-1997 RMK Started disconnect support 25 * 08-02-1998 RMK Corrected real DMA support 26 * 15-02-1998 RMK Started sync xfer support 27 * 06-04-1998 RMK Tightened conditions for printing incomplete 28 * transfers 29 * 02-05-1998 RMK Added extra checks in fas216_reset 30 * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns 31 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h 32 * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT 33 * 02-04-2000 RMK Converted to use the new error handling, and 34 * automatically request sense data upon check 35 * condition status from targets. 36 */ 37 #include <linux/module.h> 38 #include <linux/blkdev.h> 39 #include <linux/kernel.h> 40 #include <linux/string.h> 41 #include <linux/ioport.h> 42 #include <linux/proc_fs.h> 43 #include <linux/delay.h> 44 #include <linux/bitops.h> 45 #include <linux/init.h> 46 #include <linux/interrupt.h> 47 48 #include <asm/dma.h> 49 #include <asm/io.h> 50 #include <asm/irq.h> 51 #include <asm/ecard.h> 52 53 #include "../scsi.h" 54 #include <scsi/scsi_dbg.h> 55 #include <scsi/scsi_host.h> 56 #include "fas216.h" 57 #include "scsi.h" 58 59 /* NOTE: SCSI2 Synchronous transfers *require* DMA according to 60 * the data sheet. This restriction is crazy, especially when 61 * you only want to send 16 bytes! What were the guys who 62 * designed this chip on at that time? Did they read the SCSI2 63 * spec at all? The following sections are taken from the SCSI2 64 * standard (s2r10) concerning this: 65 * 66 * > IMPLEMENTORS NOTES: 67 * > (1) Re-negotiation at every selection is not recommended, since a 68 * > significant performance impact is likely. 69 * 70 * > The implied synchronous agreement shall remain in effect until a BUS DEVICE 71 * > RESET message is received, until a hard reset condition occurs, or until one 72 * > of the two SCSI devices elects to modify the agreement. The default data 73 * > transfer mode is asynchronous data transfer mode. The default data transfer 74 * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard 75 * > reset condition. 76 * 77 * In total, this means that once you have elected to use synchronous 78 * transfers, you must always use DMA. 79 * 80 * I was thinking that this was a good chip until I found this restriction ;( 81 */ 82 #define SCSI2_SYNC 83 #undef SCSI2_TAG 84 85 #undef DEBUG_CONNECT 86 #undef DEBUG_MESSAGES 87 88 #undef CHECK_STRUCTURE 89 90 #define LOG_CONNECT (1 << 0) 91 #define LOG_BUSSERVICE (1 << 1) 92 #define LOG_FUNCTIONDONE (1 << 2) 93 #define LOG_MESSAGES (1 << 3) 94 #define LOG_BUFFER (1 << 4) 95 #define LOG_ERROR (1 << 8) 96 97 static int level_mask = LOG_ERROR; 98 99 module_param(level_mask, int, 0644); 100 101 static int __init fas216_log_setup(char *str) 102 { 103 char *s; 104 105 level_mask = 0; 106 107 while ((s = strsep(&str, ",")) != NULL) { 108 switch (s[0]) { 109 case 'a': 110 if (strcmp(s, "all") == 0) 111 level_mask |= -1; 112 break; 113 case 'b': 114 if (strncmp(s, "bus", 3) == 0) 115 level_mask |= LOG_BUSSERVICE; 116 if (strncmp(s, "buf", 3) == 0) 117 level_mask |= LOG_BUFFER; 118 break; 119 case 'c': 120 level_mask |= LOG_CONNECT; 121 break; 122 case 'e': 123 level_mask |= LOG_ERROR; 124 break; 125 case 'm': 126 level_mask |= LOG_MESSAGES; 127 break; 128 case 'n': 129 if (strcmp(s, "none") == 0) 130 level_mask = 0; 131 break; 132 case 's': 133 level_mask |= LOG_FUNCTIONDONE; 134 break; 135 } 136 } 137 return 1; 138 } 139 140 __setup("fas216_logging=", fas216_log_setup); 141 142 static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg) 143 { 144 unsigned int off = reg << info->scsi.io_shift; 145 return readb(info->scsi.io_base + off); 146 } 147 148 static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val) 149 { 150 unsigned int off = reg << info->scsi.io_shift; 151 writeb(val, info->scsi.io_base + off); 152 } 153 154 static void fas216_dumpstate(FAS216_Info *info) 155 { 156 unsigned char is, stat, inst; 157 158 is = fas216_readb(info, REG_IS); 159 stat = fas216_readb(info, REG_STAT); 160 inst = fas216_readb(info, REG_INST); 161 162 printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X" 163 " INST=%02X IS=%02X CFIS=%02X", 164 fas216_readb(info, REG_CTCL), 165 fas216_readb(info, REG_CTCM), 166 fas216_readb(info, REG_CMD), stat, inst, is, 167 fas216_readb(info, REG_CFIS)); 168 printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n", 169 fas216_readb(info, REG_CNTL1), 170 fas216_readb(info, REG_CNTL2), 171 fas216_readb(info, REG_CNTL3), 172 fas216_readb(info, REG_CTCH)); 173 } 174 175 static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix) 176 { 177 printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s", 178 prefix, SCp->ptr, SCp->this_residual, SCp->buffer, 179 SCp->buffers_residual, suffix); 180 } 181 182 #ifdef CHECK_STRUCTURE 183 static void fas216_dumpinfo(FAS216_Info *info) 184 { 185 static int used = 0; 186 int i; 187 188 if (used++) 189 return; 190 191 printk("FAS216_Info=\n"); 192 printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n", 193 info->magic_start, info->host, info->SCpnt, 194 info->origSCpnt); 195 printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n", 196 info->scsi.io_shift, info->scsi.irq, 197 info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2], 198 info->scsi.cfg[3]); 199 printk(" type=%p phase=%X\n", 200 info->scsi.type, info->scsi.phase); 201 print_SCp(&info->scsi.SCp, " SCp={ ", " }\n"); 202 printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n", 203 info->scsi.async_stp, 204 info->scsi.disconnectable, info->scsi.aborting); 205 printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n" 206 " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n", 207 info->stats.queues, info->stats.removes, info->stats.fins, 208 info->stats.reads, info->stats.writes, info->stats.miscs, 209 info->stats.disconnects, info->stats.aborts, info->stats.bus_resets, 210 info->stats.host_resets); 211 printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n", 212 info->ifcfg.clockrate, info->ifcfg.select_timeout, 213 info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth); 214 for (i = 0; i < 8; i++) { 215 printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n", 216 i, info->busyluns[i], i, 217 info->device[i].disconnect_ok, info->device[i].stp, 218 info->device[i].sof, info->device[i].sync_state); 219 } 220 printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n", 221 info->dma.transfer_type, info->dma.setup, 222 info->dma.pseudo, info->dma.stop); 223 printk(" internal_done=%X magic_end=%lX }\n", 224 info->internal_done, info->magic_end); 225 } 226 227 static void __fas216_checkmagic(FAS216_Info *info, const char *func) 228 { 229 int corruption = 0; 230 if (info->magic_start != MAGIC) { 231 printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n"); 232 corruption++; 233 } 234 if (info->magic_end != MAGIC) { 235 printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n"); 236 corruption++; 237 } 238 if (corruption) { 239 fas216_dumpinfo(info); 240 panic("scsi memory space corrupted in %s", func); 241 } 242 } 243 #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__) 244 #else 245 #define fas216_checkmagic(info) 246 #endif 247 248 static const char *fas216_bus_phase(int stat) 249 { 250 static const char *phases[] = { 251 "DATA OUT", "DATA IN", 252 "COMMAND", "STATUS", 253 "MISC OUT", "MISC IN", 254 "MESG OUT", "MESG IN" 255 }; 256 257 return phases[stat & STAT_BUSMASK]; 258 } 259 260 static const char *fas216_drv_phase(FAS216_Info *info) 261 { 262 static const char *phases[] = { 263 [PHASE_IDLE] = "idle", 264 [PHASE_SELECTION] = "selection", 265 [PHASE_COMMAND] = "command", 266 [PHASE_DATAOUT] = "data out", 267 [PHASE_DATAIN] = "data in", 268 [PHASE_MSGIN] = "message in", 269 [PHASE_MSGIN_DISCONNECT]= "disconnect", 270 [PHASE_MSGOUT_EXPECT] = "expect message out", 271 [PHASE_MSGOUT] = "message out", 272 [PHASE_STATUS] = "status", 273 [PHASE_DONE] = "done", 274 }; 275 276 if (info->scsi.phase < ARRAY_SIZE(phases) && 277 phases[info->scsi.phase]) 278 return phases[info->scsi.phase]; 279 return "???"; 280 } 281 282 static char fas216_target(FAS216_Info *info) 283 { 284 if (info->SCpnt) 285 return '0' + info->SCpnt->device->id; 286 else 287 return 'H'; 288 } 289 290 static void 291 fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap) 292 { 293 static char buf[1024]; 294 295 vsnprintf(buf, sizeof(buf), fmt, ap); 296 printk("scsi%d.%c: %s", info->host->host_no, target, buf); 297 } 298 299 static void fas216_log_command(FAS216_Info *info, int level, 300 struct scsi_cmnd *SCpnt, char *fmt, ...) 301 { 302 va_list args; 303 304 if (level != 0 && !(level & level_mask)) 305 return; 306 307 va_start(args, fmt); 308 fas216_do_log(info, '0' + SCpnt->device->id, fmt, args); 309 va_end(args); 310 311 scsi_print_command(SCpnt); 312 } 313 314 static void 315 fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...) 316 { 317 va_list args; 318 319 if (level != 0 && !(level & level_mask)) 320 return; 321 322 if (target < 0) 323 target = 'H'; 324 else 325 target += '0'; 326 327 va_start(args, fmt); 328 fas216_do_log(info, target, fmt, args); 329 va_end(args); 330 331 printk("\n"); 332 } 333 334 static void fas216_log(FAS216_Info *info, int level, char *fmt, ...) 335 { 336 va_list args; 337 338 if (level != 0 && !(level & level_mask)) 339 return; 340 341 va_start(args, fmt); 342 fas216_do_log(info, fas216_target(info), fmt, args); 343 va_end(args); 344 345 printk("\n"); 346 } 347 348 #define PH_SIZE 32 349 350 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE]; 351 static int ph_ptr; 352 353 static void add_debug_list(int stat, int ssr, int isr, int ph) 354 { 355 ph_list[ph_ptr].stat = stat; 356 ph_list[ph_ptr].ssr = ssr; 357 ph_list[ph_ptr].isr = isr; 358 ph_list[ph_ptr].ph = ph; 359 360 ph_ptr = (ph_ptr + 1) & (PH_SIZE-1); 361 } 362 363 static struct { int command; void *from; } cmd_list[8]; 364 static int cmd_ptr; 365 366 static void fas216_cmd(FAS216_Info *info, unsigned int command) 367 { 368 cmd_list[cmd_ptr].command = command; 369 cmd_list[cmd_ptr].from = __builtin_return_address(0); 370 371 cmd_ptr = (cmd_ptr + 1) & 7; 372 373 fas216_writeb(info, REG_CMD, command); 374 } 375 376 static void print_debug_list(void) 377 { 378 int i; 379 380 i = ph_ptr; 381 382 printk(KERN_ERR "SCSI IRQ trail\n"); 383 do { 384 printk(" %02x:%02x:%02x:%1x", 385 ph_list[i].stat, ph_list[i].ssr, 386 ph_list[i].isr, ph_list[i].ph); 387 i = (i + 1) & (PH_SIZE - 1); 388 if (((i ^ ph_ptr) & 7) == 0) 389 printk("\n"); 390 } while (i != ph_ptr); 391 if ((i ^ ph_ptr) & 7) 392 printk("\n"); 393 394 i = cmd_ptr; 395 printk(KERN_ERR "FAS216 commands: "); 396 do { 397 printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from); 398 i = (i + 1) & 7; 399 } while (i != cmd_ptr); 400 printk("\n"); 401 } 402 403 static void fas216_done(FAS216_Info *info, unsigned int result); 404 405 /** 406 * fas216_get_last_msg - retrive last message from the list 407 * @info: interface to search 408 * @pos: current fifo position 409 * 410 * Retrieve a last message from the list, using position in fifo. 411 */ 412 static inline unsigned short 413 fas216_get_last_msg(FAS216_Info *info, int pos) 414 { 415 unsigned short packed_msg = NOP; 416 struct message *msg; 417 int msgnr = 0; 418 419 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 420 if (pos >= msg->fifo) 421 break; 422 } 423 424 if (msg) { 425 if (msg->msg[0] == EXTENDED_MESSAGE) 426 packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8; 427 else 428 packed_msg = msg->msg[0]; 429 } 430 431 fas216_log(info, LOG_MESSAGES, 432 "Message: %04x found at position %02x\n", packed_msg, pos); 433 434 return packed_msg; 435 } 436 437 /** 438 * fas216_syncperiod - calculate STP register value 439 * @info: state structure for interface connected to device 440 * @ns: period in ns (between subsequent bytes) 441 * 442 * Calculate value to be loaded into the STP register for a given period 443 * in ns. Returns a value suitable for REG_STP. 444 */ 445 static int fas216_syncperiod(FAS216_Info *info, int ns) 446 { 447 int value = (info->ifcfg.clockrate * ns) / 1000; 448 449 fas216_checkmagic(info); 450 451 if (value < 4) 452 value = 4; 453 else if (value > 35) 454 value = 35; 455 456 return value & 31; 457 } 458 459 /** 460 * fas216_set_sync - setup FAS216 chip for specified transfer period. 461 * @info: state structure for interface connected to device 462 * @target: target 463 * 464 * Correctly setup FAS216 chip for specified transfer period. 465 * Notes : we need to switch the chip out of FASTSCSI mode if we have 466 * a transfer period >= 200ns - otherwise the chip will violate 467 * the SCSI timings. 468 */ 469 static void fas216_set_sync(FAS216_Info *info, int target) 470 { 471 unsigned int cntl3; 472 473 fas216_writeb(info, REG_SOF, info->device[target].sof); 474 fas216_writeb(info, REG_STP, info->device[target].stp); 475 476 cntl3 = info->scsi.cfg[2]; 477 if (info->device[target].period >= (200 / 4)) 478 cntl3 = cntl3 & ~CNTL3_FASTSCSI; 479 480 fas216_writeb(info, REG_CNTL3, cntl3); 481 } 482 483 /* Synchronous transfer support 484 * 485 * Note: The SCSI II r10 spec says (5.6.12): 486 * 487 * (2) Due to historical problems with early host adapters that could 488 * not accept an SDTR message, some targets may not initiate synchronous 489 * negotiation after a power cycle as required by this standard. Host 490 * adapters that support synchronous mode may avoid the ensuing failure 491 * modes when the target is independently power cycled by initiating a 492 * synchronous negotiation on each REQUEST SENSE and INQUIRY command. 493 * This approach increases the SCSI bus overhead and is not recommended 494 * for new implementations. The correct method is to respond to an 495 * SDTR message with a MESSAGE REJECT message if the either the 496 * initiator or target devices does not support synchronous transfers 497 * or does not want to negotiate for synchronous transfers at the time. 498 * Using the correct method assures compatibility with wide data 499 * transfers and future enhancements. 500 * 501 * We will always initiate a synchronous transfer negotiation request on 502 * every INQUIRY or REQUEST SENSE message, unless the target itself has 503 * at some point performed a synchronous transfer negotiation request, or 504 * we have synchronous transfers disabled for this device. 505 */ 506 507 /** 508 * fas216_handlesync - Handle a synchronous transfer message 509 * @info: state structure for interface 510 * @msg: message from target 511 * 512 * Handle a synchronous transfer message from the target 513 */ 514 static void fas216_handlesync(FAS216_Info *info, char *msg) 515 { 516 struct fas216_device *dev = &info->device[info->SCpnt->device->id]; 517 enum { sync, async, none, reject } res = none; 518 519 #ifdef SCSI2_SYNC 520 switch (msg[0]) { 521 case MESSAGE_REJECT: 522 /* Synchronous transfer request failed. 523 * Note: SCSI II r10: 524 * 525 * SCSI devices that are capable of synchronous 526 * data transfers shall not respond to an SDTR 527 * message with a MESSAGE REJECT message. 528 * 529 * Hence, if we get this condition, we disable 530 * negotiation for this device. 531 */ 532 if (dev->sync_state == neg_inprogress) { 533 dev->sync_state = neg_invalid; 534 res = async; 535 } 536 break; 537 538 case EXTENDED_MESSAGE: 539 switch (dev->sync_state) { 540 /* We don't accept synchronous transfer requests. 541 * Respond with a MESSAGE_REJECT to prevent a 542 * synchronous transfer agreement from being reached. 543 */ 544 case neg_invalid: 545 res = reject; 546 break; 547 548 /* We were not negotiating a synchronous transfer, 549 * but the device sent us a negotiation request. 550 * Honour the request by sending back a SDTR 551 * message containing our capability, limited by 552 * the targets capability. 553 */ 554 default: 555 fas216_cmd(info, CMD_SETATN); 556 if (msg[4] > info->ifcfg.sync_max_depth) 557 msg[4] = info->ifcfg.sync_max_depth; 558 if (msg[3] < 1000 / info->ifcfg.clockrate) 559 msg[3] = 1000 / info->ifcfg.clockrate; 560 561 msgqueue_flush(&info->scsi.msgs); 562 msgqueue_addmsg(&info->scsi.msgs, 5, 563 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 564 msg[3], msg[4]); 565 info->scsi.phase = PHASE_MSGOUT_EXPECT; 566 567 /* This is wrong. The agreement is not in effect 568 * until this message is accepted by the device 569 */ 570 dev->sync_state = neg_targcomplete; 571 res = sync; 572 break; 573 574 /* We initiated the synchronous transfer negotiation, 575 * and have successfully received a response from the 576 * target. The synchronous transfer agreement has been 577 * reached. Note: if the values returned are out of our 578 * bounds, we must reject the message. 579 */ 580 case neg_inprogress: 581 res = reject; 582 if (msg[4] <= info->ifcfg.sync_max_depth && 583 msg[3] >= 1000 / info->ifcfg.clockrate) { 584 dev->sync_state = neg_complete; 585 res = sync; 586 } 587 break; 588 } 589 } 590 #else 591 res = reject; 592 #endif 593 594 switch (res) { 595 case sync: 596 dev->period = msg[3]; 597 dev->sof = msg[4]; 598 dev->stp = fas216_syncperiod(info, msg[3] * 4); 599 fas216_set_sync(info, info->SCpnt->device->id); 600 break; 601 602 case reject: 603 fas216_cmd(info, CMD_SETATN); 604 msgqueue_flush(&info->scsi.msgs); 605 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 606 info->scsi.phase = PHASE_MSGOUT_EXPECT; 607 608 case async: 609 dev->period = info->ifcfg.asyncperiod / 4; 610 dev->sof = 0; 611 dev->stp = info->scsi.async_stp; 612 fas216_set_sync(info, info->SCpnt->device->id); 613 break; 614 615 case none: 616 break; 617 } 618 } 619 620 /** 621 * fas216_updateptrs - update data pointers after transfer suspended/paused 622 * @info: interface's local pointer to update 623 * @bytes_transferred: number of bytes transferred 624 * 625 * Update data pointers after transfer suspended/paused 626 */ 627 static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred) 628 { 629 struct scsi_pointer *SCp = &info->scsi.SCp; 630 631 fas216_checkmagic(info); 632 633 BUG_ON(bytes_transferred < 0); 634 635 SCp->phase -= bytes_transferred; 636 637 while (bytes_transferred != 0) { 638 if (SCp->this_residual > bytes_transferred) 639 break; 640 /* 641 * We have used up this buffer. Move on to the 642 * next buffer. 643 */ 644 bytes_transferred -= SCp->this_residual; 645 if (!next_SCp(SCp) && bytes_transferred) { 646 printk(KERN_WARNING "scsi%d.%c: out of buffers\n", 647 info->host->host_no, '0' + info->SCpnt->device->id); 648 return; 649 } 650 } 651 652 SCp->this_residual -= bytes_transferred; 653 if (SCp->this_residual) 654 SCp->ptr += bytes_transferred; 655 else 656 SCp->ptr = NULL; 657 } 658 659 /** 660 * fas216_pio - transfer data off of/on to card using programmed IO 661 * @info: interface to transfer data to/from 662 * @direction: direction to transfer data (DMA_OUT/DMA_IN) 663 * 664 * Transfer data off of/on to card using programmed IO. 665 * Notes: this is incredibly slow. 666 */ 667 static void fas216_pio(FAS216_Info *info, fasdmadir_t direction) 668 { 669 struct scsi_pointer *SCp = &info->scsi.SCp; 670 671 fas216_checkmagic(info); 672 673 if (direction == DMA_OUT) 674 fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp)); 675 else 676 put_next_SCp_byte(SCp, fas216_readb(info, REG_FF)); 677 678 if (SCp->this_residual == 0) 679 next_SCp(SCp); 680 } 681 682 static void fas216_set_stc(FAS216_Info *info, unsigned int length) 683 { 684 fas216_writeb(info, REG_STCL, length); 685 fas216_writeb(info, REG_STCM, length >> 8); 686 fas216_writeb(info, REG_STCH, length >> 16); 687 } 688 689 static unsigned int fas216_get_ctc(FAS216_Info *info) 690 { 691 return fas216_readb(info, REG_CTCL) + 692 (fas216_readb(info, REG_CTCM) << 8) + 693 (fas216_readb(info, REG_CTCH) << 16); 694 } 695 696 /** 697 * fas216_cleanuptransfer - clean up after a transfer has completed. 698 * @info: interface to clean up 699 * 700 * Update the data pointers according to the number of bytes transferred 701 * on the SCSI bus. 702 */ 703 static void fas216_cleanuptransfer(FAS216_Info *info) 704 { 705 unsigned long total, residual, fifo; 706 fasdmatype_t dmatype = info->dma.transfer_type; 707 708 info->dma.transfer_type = fasdma_none; 709 710 /* 711 * PIO transfers do not need to be cleaned up. 712 */ 713 if (dmatype == fasdma_pio || dmatype == fasdma_none) 714 return; 715 716 if (dmatype == fasdma_real_all) 717 total = info->scsi.SCp.phase; 718 else 719 total = info->scsi.SCp.this_residual; 720 721 residual = fas216_get_ctc(info); 722 723 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 724 725 fas216_log(info, LOG_BUFFER, "cleaning up from previous " 726 "transfer: length 0x%06x, residual 0x%x, fifo %d", 727 total, residual, fifo); 728 729 /* 730 * If we were performing Data-Out, the transfer counter 731 * counts down each time a byte is transferred by the 732 * host to the FIFO. This means we must include the 733 * bytes left in the FIFO from the transfer counter. 734 */ 735 if (info->scsi.phase == PHASE_DATAOUT) 736 residual += fifo; 737 738 fas216_updateptrs(info, total - residual); 739 } 740 741 /** 742 * fas216_transfer - Perform a DMA/PIO transfer off of/on to card 743 * @info: interface from which device disconnected from 744 * 745 * Start a DMA/PIO transfer off of/on to card 746 */ 747 static void fas216_transfer(FAS216_Info *info) 748 { 749 fasdmadir_t direction; 750 fasdmatype_t dmatype; 751 752 fas216_log(info, LOG_BUFFER, 753 "starttransfer: buffer %p length 0x%06x reqlen 0x%06x", 754 info->scsi.SCp.ptr, info->scsi.SCp.this_residual, 755 info->scsi.SCp.phase); 756 757 if (!info->scsi.SCp.ptr) { 758 fas216_log(info, LOG_ERROR, "null buffer passed to " 759 "fas216_starttransfer"); 760 print_SCp(&info->scsi.SCp, "SCp: ", "\n"); 761 print_SCp(&info->SCpnt->SCp, "Cmnd SCp: ", "\n"); 762 return; 763 } 764 765 /* 766 * If we have a synchronous transfer agreement in effect, we must 767 * use DMA mode. If we are using asynchronous transfers, we may 768 * use DMA mode or PIO mode. 769 */ 770 if (info->device[info->SCpnt->device->id].sof) 771 dmatype = fasdma_real_all; 772 else 773 dmatype = fasdma_pio; 774 775 if (info->scsi.phase == PHASE_DATAOUT) 776 direction = DMA_OUT; 777 else 778 direction = DMA_IN; 779 780 if (info->dma.setup) 781 dmatype = info->dma.setup(info->host, &info->scsi.SCp, 782 direction, dmatype); 783 info->dma.transfer_type = dmatype; 784 785 if (dmatype == fasdma_real_all) 786 fas216_set_stc(info, info->scsi.SCp.phase); 787 else 788 fas216_set_stc(info, info->scsi.SCp.this_residual); 789 790 switch (dmatype) { 791 case fasdma_pio: 792 fas216_log(info, LOG_BUFFER, "PIO transfer"); 793 fas216_writeb(info, REG_SOF, 0); 794 fas216_writeb(info, REG_STP, info->scsi.async_stp); 795 fas216_cmd(info, CMD_TRANSFERINFO); 796 fas216_pio(info, direction); 797 break; 798 799 case fasdma_pseudo: 800 fas216_log(info, LOG_BUFFER, "pseudo transfer"); 801 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 802 info->dma.pseudo(info->host, &info->scsi.SCp, 803 direction, info->SCpnt->transfersize); 804 break; 805 806 case fasdma_real_block: 807 fas216_log(info, LOG_BUFFER, "block dma transfer"); 808 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 809 break; 810 811 case fasdma_real_all: 812 fas216_log(info, LOG_BUFFER, "total dma transfer"); 813 fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); 814 break; 815 816 default: 817 fas216_log(info, LOG_BUFFER | LOG_ERROR, 818 "invalid FAS216 DMA type"); 819 break; 820 } 821 } 822 823 /** 824 * fas216_stoptransfer - Stop a DMA transfer onto / off of the card 825 * @info: interface from which device disconnected from 826 * 827 * Called when we switch away from DATA IN or DATA OUT phases. 828 */ 829 static void fas216_stoptransfer(FAS216_Info *info) 830 { 831 fas216_checkmagic(info); 832 833 if (info->dma.transfer_type == fasdma_real_all || 834 info->dma.transfer_type == fasdma_real_block) 835 info->dma.stop(info->host, &info->scsi.SCp); 836 837 fas216_cleanuptransfer(info); 838 839 if (info->scsi.phase == PHASE_DATAIN) { 840 unsigned int fifo; 841 842 /* 843 * If we were performing Data-In, then the FIFO counter 844 * contains the number of bytes not transferred via DMA 845 * from the on-board FIFO. Read them manually. 846 */ 847 fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 848 while (fifo && info->scsi.SCp.ptr) { 849 *info->scsi.SCp.ptr = fas216_readb(info, REG_FF); 850 fas216_updateptrs(info, 1); 851 fifo--; 852 } 853 } else { 854 /* 855 * After a Data-Out phase, there may be unsent 856 * bytes left in the FIFO. Flush them out. 857 */ 858 fas216_cmd(info, CMD_FLUSHFIFO); 859 } 860 } 861 862 static void fas216_aborttransfer(FAS216_Info *info) 863 { 864 fas216_checkmagic(info); 865 866 if (info->dma.transfer_type == fasdma_real_all || 867 info->dma.transfer_type == fasdma_real_block) 868 info->dma.stop(info->host, &info->scsi.SCp); 869 870 info->dma.transfer_type = fasdma_none; 871 fas216_cmd(info, CMD_FLUSHFIFO); 872 } 873 874 static void fas216_kick(FAS216_Info *info); 875 876 /** 877 * fas216_disconnected_intr - handle device disconnection 878 * @info: interface from which device disconnected from 879 * 880 * Handle device disconnection 881 */ 882 static void fas216_disconnect_intr(FAS216_Info *info) 883 { 884 unsigned long flags; 885 886 fas216_checkmagic(info); 887 888 fas216_log(info, LOG_CONNECT, "disconnect phase=%02x", 889 info->scsi.phase); 890 891 msgqueue_flush(&info->scsi.msgs); 892 893 switch (info->scsi.phase) { 894 case PHASE_SELECTION: /* while selecting - no target */ 895 case PHASE_SELSTEPS: 896 fas216_done(info, DID_NO_CONNECT); 897 break; 898 899 case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */ 900 info->scsi.disconnectable = 1; 901 info->scsi.phase = PHASE_IDLE; 902 info->stats.disconnects += 1; 903 spin_lock_irqsave(&info->host_lock, flags); 904 if (info->scsi.phase == PHASE_IDLE) 905 fas216_kick(info); 906 spin_unlock_irqrestore(&info->host_lock, flags); 907 break; 908 909 case PHASE_DONE: /* at end of command - complete */ 910 fas216_done(info, DID_OK); 911 break; 912 913 case PHASE_MSGOUT: /* message out - possible ABORT message */ 914 if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) { 915 info->scsi.aborting = 0; 916 fas216_done(info, DID_ABORT); 917 break; 918 } 919 920 default: /* huh? */ 921 printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n", 922 info->host->host_no, fas216_target(info), fas216_drv_phase(info)); 923 print_debug_list(); 924 fas216_stoptransfer(info); 925 fas216_done(info, DID_ERROR); 926 break; 927 } 928 } 929 930 /** 931 * fas216_reselected_intr - start reconnection of a device 932 * @info: interface which was reselected 933 * 934 * Start reconnection of a device 935 */ 936 static void 937 fas216_reselected_intr(FAS216_Info *info) 938 { 939 unsigned int cfis, i; 940 unsigned char msg[4]; 941 unsigned char target, lun, tag; 942 943 fas216_checkmagic(info); 944 945 WARN_ON(info->scsi.phase == PHASE_SELECTION || 946 info->scsi.phase == PHASE_SELSTEPS); 947 948 cfis = fas216_readb(info, REG_CFIS); 949 950 fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x", 951 info->scsi.phase, cfis); 952 953 cfis &= CFIS_CF; 954 955 if (cfis < 2 || cfis > 4) { 956 printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n", 957 info->host->host_no); 958 goto bad_message; 959 } 960 961 for (i = 0; i < cfis; i++) 962 msg[i] = fas216_readb(info, REG_FF); 963 964 if (!(msg[0] & (1 << info->host->this_id)) || 965 !(msg[1] & 0x80)) 966 goto initiator_error; 967 968 target = msg[0] & ~(1 << info->host->this_id); 969 target = ffs(target) - 1; 970 lun = msg[1] & 7; 971 tag = 0; 972 973 if (cfis >= 3) { 974 if (msg[2] != SIMPLE_QUEUE_TAG) 975 goto initiator_error; 976 977 tag = msg[3]; 978 } 979 980 /* set up for synchronous transfers */ 981 fas216_writeb(info, REG_SDID, target); 982 fas216_set_sync(info, target); 983 msgqueue_flush(&info->scsi.msgs); 984 985 fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x", 986 target, lun, tag); 987 988 if (info->scsi.disconnectable && info->SCpnt) { 989 info->scsi.disconnectable = 0; 990 if (info->SCpnt->device->id == target && 991 info->SCpnt->device->lun == lun && 992 info->SCpnt->tag == tag) { 993 fas216_log(info, LOG_CONNECT, "reconnected previously executing command"); 994 } else { 995 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 996 fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue"); 997 info->SCpnt = NULL; 998 } 999 } 1000 if (!info->SCpnt) { 1001 info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected, 1002 target, lun, tag); 1003 fas216_log(info, LOG_CONNECT, "had to get command"); 1004 } 1005 1006 if (info->SCpnt) { 1007 /* 1008 * Restore data pointer from SAVED data pointer 1009 */ 1010 info->scsi.SCp = info->SCpnt->SCp; 1011 1012 fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]", 1013 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1014 info->scsi.phase = PHASE_MSGIN; 1015 } else { 1016 /* 1017 * Our command structure not found - abort the 1018 * command on the target. Since we have no 1019 * record of this command, we can't send 1020 * an INITIATOR DETECTED ERROR message. 1021 */ 1022 fas216_cmd(info, CMD_SETATN); 1023 1024 #if 0 1025 if (tag) 1026 msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag); 1027 else 1028 #endif 1029 msgqueue_addmsg(&info->scsi.msgs, 1, ABORT); 1030 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1031 info->scsi.aborting = 1; 1032 } 1033 1034 fas216_cmd(info, CMD_MSGACCEPTED); 1035 return; 1036 1037 initiator_error: 1038 printk(KERN_ERR "scsi%d.H: error during reselection: bytes", 1039 info->host->host_no); 1040 for (i = 0; i < cfis; i++) 1041 printk(" %02x", msg[i]); 1042 printk("\n"); 1043 bad_message: 1044 fas216_cmd(info, CMD_SETATN); 1045 msgqueue_flush(&info->scsi.msgs); 1046 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1047 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1048 fas216_cmd(info, CMD_MSGACCEPTED); 1049 } 1050 1051 static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen) 1052 { 1053 int i; 1054 1055 switch (message[0]) { 1056 case COMMAND_COMPLETE: 1057 if (msglen != 1) 1058 goto unrecognised; 1059 1060 printk(KERN_ERR "scsi%d.%c: command complete with no " 1061 "status in MESSAGE_IN?\n", 1062 info->host->host_no, fas216_target(info)); 1063 break; 1064 1065 case SAVE_POINTERS: 1066 if (msglen != 1) 1067 goto unrecognised; 1068 1069 /* 1070 * Save current data pointer to SAVED data pointer 1071 * SCSI II standard says that we must not acknowledge 1072 * this until we have really saved pointers. 1073 * NOTE: we DO NOT save the command nor status pointers 1074 * as required by the SCSI II standard. These always 1075 * point to the start of their respective areas. 1076 */ 1077 info->SCpnt->SCp = info->scsi.SCp; 1078 info->SCpnt->SCp.sent_command = 0; 1079 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1080 "save data pointers: [%p, %X]", 1081 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1082 break; 1083 1084 case RESTORE_POINTERS: 1085 if (msglen != 1) 1086 goto unrecognised; 1087 1088 /* 1089 * Restore current data pointer from SAVED data pointer 1090 */ 1091 info->scsi.SCp = info->SCpnt->SCp; 1092 fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, 1093 "restore data pointers: [%p, 0x%x]", 1094 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1095 break; 1096 1097 case DISCONNECT: 1098 if (msglen != 1) 1099 goto unrecognised; 1100 1101 info->scsi.phase = PHASE_MSGIN_DISCONNECT; 1102 break; 1103 1104 case MESSAGE_REJECT: 1105 if (msglen != 1) 1106 goto unrecognised; 1107 1108 switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) { 1109 case EXTENDED_MESSAGE | EXTENDED_SDTR << 8: 1110 fas216_handlesync(info, message); 1111 break; 1112 1113 default: 1114 fas216_log(info, 0, "reject, last message 0x%04x", 1115 fas216_get_last_msg(info, info->scsi.msgin_fifo)); 1116 } 1117 break; 1118 1119 case NOP: 1120 break; 1121 1122 case EXTENDED_MESSAGE: 1123 if (msglen < 3) 1124 goto unrecognised; 1125 1126 switch (message[2]) { 1127 case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */ 1128 fas216_handlesync(info, message); 1129 break; 1130 1131 default: 1132 goto unrecognised; 1133 } 1134 break; 1135 1136 default: 1137 goto unrecognised; 1138 } 1139 return; 1140 1141 unrecognised: 1142 fas216_log(info, 0, "unrecognised message, rejecting"); 1143 printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info)); 1144 for (i = 0; i < msglen; i++) 1145 printk("%s%02X", i & 31 ? " " : "\n ", message[i]); 1146 printk("\n"); 1147 1148 /* 1149 * Something strange seems to be happening here - 1150 * I can't use SETATN since the chip gives me an 1151 * invalid command interrupt when I do. Weird. 1152 */ 1153 fas216_cmd(info, CMD_NOP); 1154 fas216_dumpstate(info); 1155 fas216_cmd(info, CMD_SETATN); 1156 msgqueue_flush(&info->scsi.msgs); 1157 msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); 1158 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1159 fas216_dumpstate(info); 1160 } 1161 1162 static int fas216_wait_cmd(FAS216_Info *info, int cmd) 1163 { 1164 int tout; 1165 int stat; 1166 1167 fas216_cmd(info, cmd); 1168 1169 for (tout = 1000; tout; tout -= 1) { 1170 stat = fas216_readb(info, REG_STAT); 1171 if (stat & (STAT_INT|STAT_PARITYERROR)) 1172 break; 1173 udelay(1); 1174 } 1175 1176 return stat; 1177 } 1178 1179 static int fas216_get_msg_byte(FAS216_Info *info) 1180 { 1181 unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED); 1182 1183 if ((stat & STAT_INT) == 0) 1184 goto timedout; 1185 1186 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1187 goto unexpected_phase_change; 1188 1189 fas216_readb(info, REG_INST); 1190 1191 stat = fas216_wait_cmd(info, CMD_TRANSFERINFO); 1192 1193 if ((stat & STAT_INT) == 0) 1194 goto timedout; 1195 1196 if (stat & STAT_PARITYERROR) 1197 goto parity_error; 1198 1199 if ((stat & STAT_BUSMASK) != STAT_MESGIN) 1200 goto unexpected_phase_change; 1201 1202 fas216_readb(info, REG_INST); 1203 1204 return fas216_readb(info, REG_FF); 1205 1206 timedout: 1207 fas216_log(info, LOG_ERROR, "timed out waiting for message byte"); 1208 return -1; 1209 1210 unexpected_phase_change: 1211 fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat); 1212 return -2; 1213 1214 parity_error: 1215 fas216_log(info, LOG_ERROR, "parity error during message in phase"); 1216 return -3; 1217 } 1218 1219 /** 1220 * fas216_message - handle a function done interrupt from FAS216 chip 1221 * @info: interface which caused function done interrupt 1222 * 1223 * Handle a function done interrupt from FAS216 chip 1224 */ 1225 static void fas216_message(FAS216_Info *info) 1226 { 1227 unsigned char *message = info->scsi.message; 1228 unsigned int msglen = 1; 1229 int msgbyte = 0; 1230 1231 fas216_checkmagic(info); 1232 1233 message[0] = fas216_readb(info, REG_FF); 1234 1235 if (message[0] == EXTENDED_MESSAGE) { 1236 msgbyte = fas216_get_msg_byte(info); 1237 1238 if (msgbyte >= 0) { 1239 message[1] = msgbyte; 1240 1241 for (msglen = 2; msglen < message[1] + 2; msglen++) { 1242 msgbyte = fas216_get_msg_byte(info); 1243 1244 if (msgbyte >= 0) 1245 message[msglen] = msgbyte; 1246 else 1247 break; 1248 } 1249 } 1250 } 1251 1252 if (msgbyte == -3) 1253 goto parity_error; 1254 1255 #ifdef DEBUG_MESSAGES 1256 { 1257 int i; 1258 1259 printk("scsi%d.%c: message in: ", 1260 info->host->host_no, fas216_target(info)); 1261 for (i = 0; i < msglen; i++) 1262 printk("%02X ", message[i]); 1263 printk("\n"); 1264 } 1265 #endif 1266 1267 fas216_parse_message(info, message, msglen); 1268 fas216_cmd(info, CMD_MSGACCEPTED); 1269 return; 1270 1271 parity_error: 1272 fas216_cmd(info, CMD_SETATN); 1273 msgqueue_flush(&info->scsi.msgs); 1274 msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR); 1275 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1276 fas216_cmd(info, CMD_MSGACCEPTED); 1277 return; 1278 } 1279 1280 /** 1281 * fas216_send_command - send command after all message bytes have been sent 1282 * @info: interface which caused bus service 1283 * 1284 * Send a command to a target after all message bytes have been sent 1285 */ 1286 static void fas216_send_command(FAS216_Info *info) 1287 { 1288 int i; 1289 1290 fas216_checkmagic(info); 1291 1292 fas216_cmd(info, CMD_NOP|CMD_WITHDMA); 1293 fas216_cmd(info, CMD_FLUSHFIFO); 1294 1295 /* load command */ 1296 for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++) 1297 fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]); 1298 1299 fas216_cmd(info, CMD_TRANSFERINFO); 1300 1301 info->scsi.phase = PHASE_COMMAND; 1302 } 1303 1304 /** 1305 * fas216_send_messageout - handle bus service to send a message 1306 * @info: interface which caused bus service 1307 * 1308 * Handle bus service to send a message. 1309 * Note: We do not allow the device to change the data direction! 1310 */ 1311 static void fas216_send_messageout(FAS216_Info *info, int start) 1312 { 1313 unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1314 1315 fas216_checkmagic(info); 1316 1317 fas216_cmd(info, CMD_FLUSHFIFO); 1318 1319 if (tot_msglen) { 1320 struct message *msg; 1321 int msgnr = 0; 1322 1323 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1324 int i; 1325 1326 for (i = start; i < msg->length; i++) 1327 fas216_writeb(info, REG_FF, msg->msg[i]); 1328 1329 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1330 start = 0; 1331 } 1332 } else 1333 fas216_writeb(info, REG_FF, NOP); 1334 1335 fas216_cmd(info, CMD_TRANSFERINFO); 1336 1337 info->scsi.phase = PHASE_MSGOUT; 1338 } 1339 1340 /** 1341 * fas216_busservice_intr - handle bus service interrupt from FAS216 chip 1342 * @info: interface which caused bus service interrupt 1343 * @stat: Status register contents 1344 * @is: SCSI Status register contents 1345 * 1346 * Handle a bus service interrupt from FAS216 chip 1347 */ 1348 static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1349 { 1350 fas216_checkmagic(info); 1351 1352 fas216_log(info, LOG_BUSSERVICE, 1353 "bus service: stat=%02x is=%02x phase=%02x", 1354 stat, is, info->scsi.phase); 1355 1356 switch (info->scsi.phase) { 1357 case PHASE_SELECTION: 1358 if ((is & IS_BITS) != IS_MSGBYTESENT) 1359 goto bad_is; 1360 break; 1361 1362 case PHASE_SELSTEPS: 1363 switch (is & IS_BITS) { 1364 case IS_SELARB: 1365 case IS_MSGBYTESENT: 1366 goto bad_is; 1367 1368 case IS_NOTCOMMAND: 1369 case IS_EARLYPHASE: 1370 if ((stat & STAT_BUSMASK) == STAT_MESGIN) 1371 break; 1372 goto bad_is; 1373 1374 case IS_COMPLETE: 1375 break; 1376 } 1377 1378 default: 1379 break; 1380 } 1381 1382 fas216_cmd(info, CMD_NOP); 1383 1384 #define STATE(st,ph) ((ph) << 3 | (st)) 1385 /* This table describes the legal SCSI state transitions, 1386 * as described by the SCSI II spec. 1387 */ 1388 switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) { 1389 case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */ 1390 case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */ 1391 case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */ 1392 case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */ 1393 info->scsi.phase = PHASE_DATAIN; 1394 fas216_transfer(info); 1395 return; 1396 1397 case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */ 1398 case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */ 1399 fas216_cleanuptransfer(info); 1400 fas216_transfer(info); 1401 return; 1402 1403 case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */ 1404 case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */ 1405 case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */ 1406 case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */ 1407 fas216_cmd(info, CMD_FLUSHFIFO); 1408 info->scsi.phase = PHASE_DATAOUT; 1409 fas216_transfer(info); 1410 return; 1411 1412 case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */ 1413 case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */ 1414 fas216_stoptransfer(info); 1415 case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */ 1416 case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */ 1417 case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */ 1418 case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */ 1419 fas216_cmd(info, CMD_INITCMDCOMPLETE); 1420 info->scsi.phase = PHASE_STATUS; 1421 return; 1422 1423 case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */ 1424 case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */ 1425 fas216_stoptransfer(info); 1426 case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */ 1427 case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */ 1428 case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */ 1429 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1430 fas216_cmd(info, CMD_FLUSHFIFO); 1431 fas216_cmd(info, CMD_TRANSFERINFO); 1432 info->scsi.phase = PHASE_MSGIN; 1433 return; 1434 1435 case STATE(STAT_MESGIN, PHASE_MSGIN): 1436 info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; 1437 fas216_cmd(info, CMD_TRANSFERINFO); 1438 return; 1439 1440 case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */ 1441 case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */ 1442 fas216_send_command(info); 1443 info->scsi.phase = PHASE_COMMAND; 1444 return; 1445 1446 1447 /* 1448 * Selection -> Message Out 1449 */ 1450 case STATE(STAT_MESGOUT, PHASE_SELECTION): 1451 fas216_send_messageout(info, 1); 1452 return; 1453 1454 /* 1455 * Message Out -> Message Out 1456 */ 1457 case STATE(STAT_MESGOUT, PHASE_SELSTEPS): 1458 case STATE(STAT_MESGOUT, PHASE_MSGOUT): 1459 /* 1460 * If we get another message out phase, this usually 1461 * means some parity error occurred. Resend complete 1462 * set of messages. If we have more than one byte to 1463 * send, we need to assert ATN again. 1464 */ 1465 if (info->device[info->SCpnt->device->id].parity_check) { 1466 /* 1467 * We were testing... good, the device 1468 * supports parity checking. 1469 */ 1470 info->device[info->SCpnt->device->id].parity_check = 0; 1471 info->device[info->SCpnt->device->id].parity_enabled = 1; 1472 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1473 } 1474 1475 if (msgqueue_msglength(&info->scsi.msgs) > 1) 1476 fas216_cmd(info, CMD_SETATN); 1477 /*FALLTHROUGH*/ 1478 1479 /* 1480 * Any -> Message Out 1481 */ 1482 case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT): 1483 fas216_send_messageout(info, 0); 1484 return; 1485 1486 /* Error recovery rules. 1487 * These either attempt to abort or retry the operation. 1488 * TODO: we need more of these 1489 */ 1490 case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */ 1491 /* error - we've sent out all the command bytes 1492 * we have. 1493 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS 1494 * to include the command bytes sent for this to work 1495 * correctly. 1496 */ 1497 printk(KERN_ERR "scsi%d.%c: " 1498 "target trying to receive more command bytes\n", 1499 info->host->host_no, fas216_target(info)); 1500 fas216_cmd(info, CMD_SETATN); 1501 fas216_set_stc(info, 15); 1502 fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA); 1503 msgqueue_flush(&info->scsi.msgs); 1504 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1505 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1506 return; 1507 } 1508 1509 if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) { 1510 printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n", 1511 info->host->host_no, fas216_target(info), 1512 fas216_bus_phase(stat)); 1513 msgqueue_flush(&info->scsi.msgs); 1514 fas216_cmd(info, CMD_SETATN); 1515 msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); 1516 info->scsi.phase = PHASE_MSGOUT_EXPECT; 1517 info->scsi.aborting = 1; 1518 fas216_cmd(info, CMD_TRANSFERINFO); 1519 return; 1520 } 1521 printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n", 1522 info->host->host_no, fas216_target(info), 1523 fas216_bus_phase(stat), 1524 fas216_drv_phase(info)); 1525 print_debug_list(); 1526 return; 1527 1528 bad_is: 1529 fas216_log(info, 0, "bus service at step %d?", is & IS_BITS); 1530 fas216_dumpstate(info); 1531 print_debug_list(); 1532 1533 fas216_done(info, DID_ERROR); 1534 } 1535 1536 /** 1537 * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip 1538 * @info: interface which caused function done interrupt 1539 * @stat: Status register contents 1540 * @is: SCSI Status register contents 1541 * 1542 * Handle a function done interrupt from FAS216 chip 1543 */ 1544 static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is) 1545 { 1546 unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF; 1547 1548 fas216_checkmagic(info); 1549 1550 fas216_log(info, LOG_FUNCTIONDONE, 1551 "function done: stat=%02x is=%02x phase=%02x", 1552 stat, is, info->scsi.phase); 1553 1554 switch (info->scsi.phase) { 1555 case PHASE_STATUS: /* status phase - read status and msg */ 1556 if (fifo_len != 2) { 1557 fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len); 1558 } 1559 /* 1560 * Read status then message byte. 1561 */ 1562 info->scsi.SCp.Status = fas216_readb(info, REG_FF); 1563 info->scsi.SCp.Message = fas216_readb(info, REG_FF); 1564 info->scsi.phase = PHASE_DONE; 1565 fas216_cmd(info, CMD_MSGACCEPTED); 1566 break; 1567 1568 case PHASE_IDLE: 1569 case PHASE_SELECTION: 1570 case PHASE_SELSTEPS: 1571 break; 1572 1573 case PHASE_MSGIN: /* message in phase */ 1574 if ((stat & STAT_BUSMASK) == STAT_MESGIN) { 1575 info->scsi.msgin_fifo = fifo_len; 1576 fas216_message(info); 1577 break; 1578 } 1579 1580 default: 1581 fas216_log(info, 0, "internal phase %s for function done?" 1582 " What do I do with this?", 1583 fas216_target(info), fas216_drv_phase(info)); 1584 } 1585 } 1586 1587 static void fas216_bus_reset(FAS216_Info *info) 1588 { 1589 neg_t sync_state; 1590 int i; 1591 1592 msgqueue_flush(&info->scsi.msgs); 1593 1594 sync_state = neg_invalid; 1595 1596 #ifdef SCSI2_SYNC 1597 if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA)) 1598 sync_state = neg_wait; 1599 #endif 1600 1601 info->scsi.phase = PHASE_IDLE; 1602 info->SCpnt = NULL; /* bug! */ 1603 memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp)); 1604 1605 for (i = 0; i < 8; i++) { 1606 info->device[i].disconnect_ok = info->ifcfg.disconnect_ok; 1607 info->device[i].sync_state = sync_state; 1608 info->device[i].period = info->ifcfg.asyncperiod / 4; 1609 info->device[i].stp = info->scsi.async_stp; 1610 info->device[i].sof = 0; 1611 info->device[i].wide_xfer = 0; 1612 } 1613 1614 info->rst_bus_status = 1; 1615 wake_up(&info->eh_wait); 1616 } 1617 1618 /** 1619 * fas216_intr - handle interrupts to progress a command 1620 * @info: interface to service 1621 * 1622 * Handle interrupts from the interface to progress a command 1623 */ 1624 irqreturn_t fas216_intr(FAS216_Info *info) 1625 { 1626 unsigned char inst, is, stat; 1627 int handled = IRQ_NONE; 1628 1629 fas216_checkmagic(info); 1630 1631 stat = fas216_readb(info, REG_STAT); 1632 is = fas216_readb(info, REG_IS); 1633 inst = fas216_readb(info, REG_INST); 1634 1635 add_debug_list(stat, is, inst, info->scsi.phase); 1636 1637 if (stat & STAT_INT) { 1638 if (inst & INST_BUSRESET) { 1639 fas216_log(info, 0, "bus reset detected"); 1640 fas216_bus_reset(info); 1641 scsi_report_bus_reset(info->host, 0); 1642 } else if (inst & INST_ILLEGALCMD) { 1643 fas216_log(info, LOG_ERROR, "illegal command given\n"); 1644 fas216_dumpstate(info); 1645 print_debug_list(); 1646 } else if (inst & INST_DISCONNECT) 1647 fas216_disconnect_intr(info); 1648 else if (inst & INST_RESELECTED) /* reselected */ 1649 fas216_reselected_intr(info); 1650 else if (inst & INST_BUSSERVICE) /* bus service request */ 1651 fas216_busservice_intr(info, stat, is); 1652 else if (inst & INST_FUNCDONE) /* function done */ 1653 fas216_funcdone_intr(info, stat, is); 1654 else 1655 fas216_log(info, 0, "unknown interrupt received:" 1656 " phase %s inst %02X is %02X stat %02X", 1657 fas216_drv_phase(info), inst, is, stat); 1658 handled = IRQ_HANDLED; 1659 } 1660 return handled; 1661 } 1662 1663 static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1664 { 1665 int tot_msglen; 1666 1667 /* following what the ESP driver says */ 1668 fas216_set_stc(info, 0); 1669 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1670 1671 /* flush FIFO */ 1672 fas216_cmd(info, CMD_FLUSHFIFO); 1673 1674 /* load bus-id and timeout */ 1675 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1676 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1677 1678 /* synchronous transfers */ 1679 fas216_set_sync(info, SCpnt->device->id); 1680 1681 tot_msglen = msgqueue_msglength(&info->scsi.msgs); 1682 1683 #ifdef DEBUG_MESSAGES 1684 { 1685 struct message *msg; 1686 int msgnr = 0, i; 1687 1688 printk("scsi%d.%c: message out: ", 1689 info->host->host_no, '0' + SCpnt->device->id); 1690 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1691 printk("{ "); 1692 for (i = 0; i < msg->length; i++) 1693 printk("%02x ", msg->msg[i]); 1694 printk("} "); 1695 } 1696 printk("\n"); 1697 } 1698 #endif 1699 1700 if (tot_msglen == 1 || tot_msglen == 3) { 1701 /* 1702 * We have an easy message length to send... 1703 */ 1704 struct message *msg; 1705 int msgnr = 0, i; 1706 1707 info->scsi.phase = PHASE_SELSTEPS; 1708 1709 /* load message bytes */ 1710 while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { 1711 for (i = 0; i < msg->length; i++) 1712 fas216_writeb(info, REG_FF, msg->msg[i]); 1713 msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); 1714 } 1715 1716 /* load command */ 1717 for (i = 0; i < SCpnt->cmd_len; i++) 1718 fas216_writeb(info, REG_FF, SCpnt->cmnd[i]); 1719 1720 if (tot_msglen == 1) 1721 fas216_cmd(info, CMD_SELECTATN); 1722 else 1723 fas216_cmd(info, CMD_SELECTATN3); 1724 } else { 1725 /* 1726 * We have an unusual number of message bytes to send. 1727 * Load first byte into fifo, and issue SELECT with ATN and 1728 * stop steps. 1729 */ 1730 struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1731 1732 fas216_writeb(info, REG_FF, msg->msg[0]); 1733 msg->fifo = 1; 1734 1735 fas216_cmd(info, CMD_SELECTATNSTOP); 1736 } 1737 } 1738 1739 /* 1740 * Decide whether we need to perform a parity test on this device. 1741 * Can also be used to force parity error conditions during initial 1742 * information transfer phase (message out) for test purposes. 1743 */ 1744 static int parity_test(FAS216_Info *info, int target) 1745 { 1746 #if 0 1747 if (target == 3) { 1748 info->device[target].parity_check = 0; 1749 return 1; 1750 } 1751 #endif 1752 return info->device[target].parity_check; 1753 } 1754 1755 static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1756 { 1757 int disconnect_ok; 1758 1759 /* 1760 * claim host busy 1761 */ 1762 info->scsi.phase = PHASE_SELECTION; 1763 info->scsi.SCp = SCpnt->SCp; 1764 info->SCpnt = SCpnt; 1765 info->dma.transfer_type = fasdma_none; 1766 1767 if (parity_test(info, SCpnt->device->id)) 1768 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE); 1769 else 1770 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 1771 1772 /* 1773 * Don't allow request sense commands to disconnect. 1774 */ 1775 disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE && 1776 info->device[SCpnt->device->id].disconnect_ok; 1777 1778 /* 1779 * build outgoing message bytes 1780 */ 1781 msgqueue_flush(&info->scsi.msgs); 1782 msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun)); 1783 1784 /* 1785 * add tag message if required 1786 */ 1787 if (SCpnt->tag) 1788 msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag); 1789 1790 do { 1791 #ifdef SCSI2_SYNC 1792 if ((info->device[SCpnt->device->id].sync_state == neg_wait || 1793 info->device[SCpnt->device->id].sync_state == neg_complete) && 1794 (SCpnt->cmnd[0] == REQUEST_SENSE || 1795 SCpnt->cmnd[0] == INQUIRY)) { 1796 info->device[SCpnt->device->id].sync_state = neg_inprogress; 1797 msgqueue_addmsg(&info->scsi.msgs, 5, 1798 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1799 1000 / info->ifcfg.clockrate, 1800 info->ifcfg.sync_max_depth); 1801 break; 1802 } 1803 #endif 1804 } while (0); 1805 1806 __fas216_start_command(info, SCpnt); 1807 } 1808 1809 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt) 1810 { 1811 #ifdef SCSI2_TAG 1812 /* 1813 * tagged queuing - allocate a new tag to this command 1814 */ 1815 if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE && 1816 SCpnt->cmnd[0] != INQUIRY) { 1817 SCpnt->device->current_tag += 1; 1818 if (SCpnt->device->current_tag == 0) 1819 SCpnt->device->current_tag = 1; 1820 SCpnt->tag = SCpnt->device->current_tag; 1821 } else 1822 #endif 1823 set_bit(SCpnt->device->id * 8 + 1824 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 1825 1826 info->stats.removes += 1; 1827 switch (SCpnt->cmnd[0]) { 1828 case WRITE_6: 1829 case WRITE_10: 1830 case WRITE_12: 1831 info->stats.writes += 1; 1832 break; 1833 case READ_6: 1834 case READ_10: 1835 case READ_12: 1836 info->stats.reads += 1; 1837 break; 1838 default: 1839 info->stats.miscs += 1; 1840 break; 1841 } 1842 } 1843 1844 static void fas216_do_bus_device_reset(FAS216_Info *info, 1845 struct scsi_cmnd *SCpnt) 1846 { 1847 struct message *msg; 1848 1849 /* 1850 * claim host busy 1851 */ 1852 info->scsi.phase = PHASE_SELECTION; 1853 info->scsi.SCp = SCpnt->SCp; 1854 info->SCpnt = SCpnt; 1855 info->dma.transfer_type = fasdma_none; 1856 1857 fas216_log(info, LOG_ERROR, "sending bus device reset"); 1858 1859 msgqueue_flush(&info->scsi.msgs); 1860 msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET); 1861 1862 /* following what the ESP driver says */ 1863 fas216_set_stc(info, 0); 1864 fas216_cmd(info, CMD_NOP | CMD_WITHDMA); 1865 1866 /* flush FIFO */ 1867 fas216_cmd(info, CMD_FLUSHFIFO); 1868 1869 /* load bus-id and timeout */ 1870 fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); 1871 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 1872 1873 /* synchronous transfers */ 1874 fas216_set_sync(info, SCpnt->device->id); 1875 1876 msg = msgqueue_getmsg(&info->scsi.msgs, 0); 1877 1878 fas216_writeb(info, REG_FF, BUS_DEVICE_RESET); 1879 msg->fifo = 1; 1880 1881 fas216_cmd(info, CMD_SELECTATNSTOP); 1882 } 1883 1884 /** 1885 * fas216_kick - kick a command to the interface 1886 * @info: our host interface to kick 1887 * 1888 * Kick a command to the interface, interface should be idle. 1889 * Notes: Interrupts are always disabled! 1890 */ 1891 static void fas216_kick(FAS216_Info *info) 1892 { 1893 struct scsi_cmnd *SCpnt = NULL; 1894 #define TYPE_OTHER 0 1895 #define TYPE_RESET 1 1896 #define TYPE_QUEUE 2 1897 int where_from = TYPE_OTHER; 1898 1899 fas216_checkmagic(info); 1900 1901 /* 1902 * Obtain the next command to process. 1903 */ 1904 do { 1905 if (info->rstSCpnt) { 1906 SCpnt = info->rstSCpnt; 1907 /* don't remove it */ 1908 where_from = TYPE_RESET; 1909 break; 1910 } 1911 1912 if (info->reqSCpnt) { 1913 SCpnt = info->reqSCpnt; 1914 info->reqSCpnt = NULL; 1915 break; 1916 } 1917 1918 if (info->origSCpnt) { 1919 SCpnt = info->origSCpnt; 1920 info->origSCpnt = NULL; 1921 break; 1922 } 1923 1924 /* retrieve next command */ 1925 if (!SCpnt) { 1926 SCpnt = queue_remove_exclude(&info->queues.issue, 1927 info->busyluns); 1928 where_from = TYPE_QUEUE; 1929 break; 1930 } 1931 } while (0); 1932 1933 if (!SCpnt) { 1934 /* 1935 * no command pending, so enable reselection. 1936 */ 1937 fas216_cmd(info, CMD_ENABLESEL); 1938 return; 1939 } 1940 1941 /* 1942 * We're going to start a command, so disable reselection 1943 */ 1944 fas216_cmd(info, CMD_DISABLESEL); 1945 1946 if (info->scsi.disconnectable && info->SCpnt) { 1947 fas216_log(info, LOG_CONNECT, 1948 "moved command for %d to disconnected queue", 1949 info->SCpnt->device->id); 1950 queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); 1951 info->scsi.disconnectable = 0; 1952 info->SCpnt = NULL; 1953 } 1954 1955 fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt, 1956 "starting"); 1957 1958 switch (where_from) { 1959 case TYPE_QUEUE: 1960 fas216_allocate_tag(info, SCpnt); 1961 case TYPE_OTHER: 1962 fas216_start_command(info, SCpnt); 1963 break; 1964 case TYPE_RESET: 1965 fas216_do_bus_device_reset(info, SCpnt); 1966 break; 1967 } 1968 1969 fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]", 1970 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 1971 1972 /* 1973 * should now get either DISCONNECT or 1974 * (FUNCTION DONE with BUS SERVICE) interrupt 1975 */ 1976 } 1977 1978 /* 1979 * Clean up from issuing a BUS DEVICE RESET message to a device. 1980 */ 1981 static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 1982 unsigned int result) 1983 { 1984 fas216_log(info, LOG_ERROR, "fas216 device reset complete"); 1985 1986 info->rstSCpnt = NULL; 1987 info->rst_dev_status = 1; 1988 wake_up(&info->eh_wait); 1989 } 1990 1991 /** 1992 * fas216_rq_sns_done - Finish processing automatic request sense command 1993 * @info: interface that completed 1994 * @SCpnt: command that completed 1995 * @result: driver byte of result 1996 * 1997 * Finish processing automatic request sense command 1998 */ 1999 static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, 2000 unsigned int result) 2001 { 2002 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2003 "request sense complete, result=0x%04x%02x%02x", 2004 result, SCpnt->SCp.Message, SCpnt->SCp.Status); 2005 2006 if (result != DID_OK || SCpnt->SCp.Status != GOOD) 2007 /* 2008 * Something went wrong. Make sure that we don't 2009 * have valid data in the sense buffer that could 2010 * confuse the higher levels. 2011 */ 2012 memset(SCpnt->sense_buffer, 0, sizeof(SCpnt->sense_buffer)); 2013 //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id); 2014 //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); } 2015 /* 2016 * Note that we don't set SCpnt->result, since that should 2017 * reflect the status of the command that we were asked by 2018 * the upper layers to process. This would have been set 2019 * correctly by fas216_std_done. 2020 */ 2021 scsi_eh_restore_cmnd(SCpnt, &info->ses); 2022 SCpnt->scsi_done(SCpnt); 2023 } 2024 2025 /** 2026 * fas216_std_done - finish processing of standard command 2027 * @info: interface that completed 2028 * @SCpnt: command that completed 2029 * @result: driver byte of result 2030 * 2031 * Finish processing of standard command 2032 */ 2033 static void 2034 fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) 2035 { 2036 info->stats.fins += 1; 2037 2038 SCpnt->result = result << 16 | info->scsi.SCp.Message << 8 | 2039 info->scsi.SCp.Status; 2040 2041 fas216_log_command(info, LOG_CONNECT, SCpnt, 2042 "command complete, result=0x%08x", SCpnt->result); 2043 2044 /* 2045 * If the driver detected an error, we're all done. 2046 */ 2047 if (host_byte(SCpnt->result) != DID_OK || 2048 msg_byte(SCpnt->result) != COMMAND_COMPLETE) 2049 goto done; 2050 2051 /* 2052 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED 2053 * status, request the sense information. 2054 */ 2055 if (status_byte(SCpnt->result) == CHECK_CONDITION || 2056 status_byte(SCpnt->result) == COMMAND_TERMINATED) 2057 goto request_sense; 2058 2059 /* 2060 * If the command did not complete with GOOD status, 2061 * we are all done here. 2062 */ 2063 if (status_byte(SCpnt->result) != GOOD) 2064 goto done; 2065 2066 /* 2067 * We have successfully completed a command. Make sure that 2068 * we do not have any buffers left to transfer. The world 2069 * is not perfect, and we seem to occasionally hit this. 2070 * It can be indicative of a buggy driver, target or the upper 2071 * levels of the SCSI code. 2072 */ 2073 if (info->scsi.SCp.ptr) { 2074 switch (SCpnt->cmnd[0]) { 2075 case INQUIRY: 2076 case START_STOP: 2077 case MODE_SENSE: 2078 break; 2079 2080 default: 2081 scmd_printk(KERN_ERR, SCpnt, 2082 "incomplete data transfer detected: res=%08X ptr=%p len=%X\n", 2083 SCpnt->result, info->scsi.SCp.ptr, 2084 info->scsi.SCp.this_residual); 2085 scsi_print_command(SCpnt); 2086 set_host_byte(SCpnt, DID_ERROR); 2087 goto request_sense; 2088 } 2089 } 2090 2091 done: 2092 if (SCpnt->scsi_done) { 2093 SCpnt->scsi_done(SCpnt); 2094 return; 2095 } 2096 2097 panic("scsi%d.H: null scsi_done function in fas216_done", 2098 info->host->host_no); 2099 2100 2101 request_sense: 2102 if (SCpnt->cmnd[0] == REQUEST_SENSE) 2103 goto done; 2104 2105 scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0); 2106 fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, 2107 "requesting sense"); 2108 init_SCp(SCpnt); 2109 SCpnt->SCp.Message = 0; 2110 SCpnt->SCp.Status = 0; 2111 SCpnt->tag = 0; 2112 SCpnt->host_scribble = (void *)fas216_rq_sns_done; 2113 2114 /* 2115 * Place this command into the high priority "request 2116 * sense" slot. This will be the very next command 2117 * executed, unless a target connects to us. 2118 */ 2119 if (info->reqSCpnt) 2120 printk(KERN_WARNING "scsi%d.%c: losing request command\n", 2121 info->host->host_no, '0' + SCpnt->device->id); 2122 info->reqSCpnt = SCpnt; 2123 } 2124 2125 /** 2126 * fas216_done - complete processing for current command 2127 * @info: interface that completed 2128 * @result: driver byte of result 2129 * 2130 * Complete processing for current command 2131 */ 2132 static void fas216_done(FAS216_Info *info, unsigned int result) 2133 { 2134 void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int); 2135 struct scsi_cmnd *SCpnt; 2136 unsigned long flags; 2137 2138 fas216_checkmagic(info); 2139 2140 if (!info->SCpnt) 2141 goto no_command; 2142 2143 SCpnt = info->SCpnt; 2144 info->SCpnt = NULL; 2145 info->scsi.phase = PHASE_IDLE; 2146 2147 if (info->scsi.aborting) { 2148 fas216_log(info, 0, "uncaught abort - returning DID_ABORT"); 2149 result = DID_ABORT; 2150 info->scsi.aborting = 0; 2151 } 2152 2153 /* 2154 * Sanity check the completion - if we have zero bytes left 2155 * to transfer, we should not have a valid pointer. 2156 */ 2157 if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) { 2158 scmd_printk(KERN_INFO, SCpnt, 2159 "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n", 2160 info->scsi.SCp.ptr, info->scsi.SCp.this_residual); 2161 info->scsi.SCp.ptr = NULL; 2162 scsi_print_command(SCpnt); 2163 } 2164 2165 /* 2166 * Clear down this command as completed. If we need to request 2167 * the sense information, fas216_kick will re-assert the busy 2168 * status. 2169 */ 2170 info->device[SCpnt->device->id].parity_check = 0; 2171 clear_bit(SCpnt->device->id * 8 + 2172 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2173 2174 fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble; 2175 fn(info, SCpnt, result); 2176 2177 if (info->scsi.irq) { 2178 spin_lock_irqsave(&info->host_lock, flags); 2179 if (info->scsi.phase == PHASE_IDLE) 2180 fas216_kick(info); 2181 spin_unlock_irqrestore(&info->host_lock, flags); 2182 } 2183 return; 2184 2185 no_command: 2186 panic("scsi%d.H: null command in fas216_done", 2187 info->host->host_no); 2188 } 2189 2190 /** 2191 * fas216_queue_command - queue a command for adapter to process. 2192 * @SCpnt: Command to queue 2193 * @done: done function to call once command is complete 2194 * 2195 * Queue a command for adapter to process. 2196 * Returns: 0 on success, else error. 2197 * Notes: io_request_lock is held, interrupts are disabled. 2198 */ 2199 static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt, 2200 void (*done)(struct scsi_cmnd *)) 2201 { 2202 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2203 int result; 2204 2205 fas216_checkmagic(info); 2206 2207 fas216_log_command(info, LOG_CONNECT, SCpnt, 2208 "received command (%p)", SCpnt); 2209 2210 SCpnt->scsi_done = done; 2211 SCpnt->host_scribble = (void *)fas216_std_done; 2212 SCpnt->result = 0; 2213 2214 init_SCp(SCpnt); 2215 2216 info->stats.queues += 1; 2217 SCpnt->tag = 0; 2218 2219 spin_lock(&info->host_lock); 2220 2221 /* 2222 * Add command into execute queue and let it complete under 2223 * whatever scheme we're using. 2224 */ 2225 result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt); 2226 2227 /* 2228 * If we successfully added the command, 2229 * kick the interface to get it moving. 2230 */ 2231 if (result == 0 && info->scsi.phase == PHASE_IDLE) 2232 fas216_kick(info); 2233 spin_unlock(&info->host_lock); 2234 2235 fas216_log_target(info, LOG_CONNECT, -1, "queue %s", 2236 result ? "failure" : "success"); 2237 2238 return result; 2239 } 2240 2241 DEF_SCSI_QCMD(fas216_queue_command) 2242 2243 /** 2244 * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command 2245 * @SCpnt: Command to wake 2246 * 2247 * Trigger restart of a waiting thread in fas216_command 2248 */ 2249 static void fas216_internal_done(struct scsi_cmnd *SCpnt) 2250 { 2251 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2252 2253 fas216_checkmagic(info); 2254 2255 info->internal_done = 1; 2256 } 2257 2258 /** 2259 * fas216_noqueue_command - process a command for the adapter. 2260 * @SCpnt: Command to queue 2261 * 2262 * Queue a command for adapter to process. 2263 * Returns: scsi result code. 2264 * Notes: io_request_lock is held, interrupts are disabled. 2265 */ 2266 static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt, 2267 void (*done)(struct scsi_cmnd *)) 2268 { 2269 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2270 2271 fas216_checkmagic(info); 2272 2273 /* 2274 * We should only be using this if we don't have an interrupt. 2275 * Provide some "incentive" to use the queueing code. 2276 */ 2277 BUG_ON(info->scsi.irq); 2278 2279 info->internal_done = 0; 2280 fas216_queue_command_lck(SCpnt, fas216_internal_done); 2281 2282 /* 2283 * This wastes time, since we can't return until the command is 2284 * complete. We can't sleep either since we may get re-entered! 2285 * However, we must re-enable interrupts, or else we'll be 2286 * waiting forever. 2287 */ 2288 spin_unlock_irq(info->host->host_lock); 2289 2290 while (!info->internal_done) { 2291 /* 2292 * If we don't have an IRQ, then we must poll the card for 2293 * it's interrupt, and use that to call this driver's 2294 * interrupt routine. That way, we keep the command 2295 * progressing. Maybe we can add some intelligence here 2296 * and go to sleep if we know that the device is going 2297 * to be some time (eg, disconnected). 2298 */ 2299 if (fas216_readb(info, REG_STAT) & STAT_INT) { 2300 spin_lock_irq(info->host->host_lock); 2301 fas216_intr(info); 2302 spin_unlock_irq(info->host->host_lock); 2303 } 2304 } 2305 2306 spin_lock_irq(info->host->host_lock); 2307 2308 done(SCpnt); 2309 2310 return 0; 2311 } 2312 2313 DEF_SCSI_QCMD(fas216_noqueue_command) 2314 2315 /* 2316 * Error handler timeout function. Indicate that we timed out, 2317 * and wake up any error handler process so it can continue. 2318 */ 2319 static void fas216_eh_timer(unsigned long data) 2320 { 2321 FAS216_Info *info = (FAS216_Info *)data; 2322 2323 fas216_log(info, LOG_ERROR, "error handling timed out\n"); 2324 2325 del_timer(&info->eh_timer); 2326 2327 if (info->rst_bus_status == 0) 2328 info->rst_bus_status = -1; 2329 if (info->rst_dev_status == 0) 2330 info->rst_dev_status = -1; 2331 2332 wake_up(&info->eh_wait); 2333 } 2334 2335 enum res_find { 2336 res_failed, /* not found */ 2337 res_success, /* command on issue queue */ 2338 res_hw_abort /* command on disconnected dev */ 2339 }; 2340 2341 /** 2342 * fas216_do_abort - decide how to abort a command 2343 * @SCpnt: command to abort 2344 * 2345 * Decide how to abort a command. 2346 * Returns: abort status 2347 */ 2348 static enum res_find fas216_find_command(FAS216_Info *info, 2349 struct scsi_cmnd *SCpnt) 2350 { 2351 enum res_find res = res_failed; 2352 2353 if (queue_remove_cmd(&info->queues.issue, SCpnt)) { 2354 /* 2355 * The command was on the issue queue, and has not been 2356 * issued yet. We can remove the command from the queue, 2357 * and acknowledge the abort. Neither the device nor the 2358 * interface know about the command. 2359 */ 2360 printk("on issue queue "); 2361 2362 res = res_success; 2363 } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) { 2364 /* 2365 * The command was on the disconnected queue. We must 2366 * reconnect with the device if possible, and send it 2367 * an abort message. 2368 */ 2369 printk("on disconnected queue "); 2370 2371 res = res_hw_abort; 2372 } else if (info->SCpnt == SCpnt) { 2373 printk("executing "); 2374 2375 switch (info->scsi.phase) { 2376 /* 2377 * If the interface is idle, and the command is 'disconnectable', 2378 * then it is the same as on the disconnected queue. 2379 */ 2380 case PHASE_IDLE: 2381 if (info->scsi.disconnectable) { 2382 info->scsi.disconnectable = 0; 2383 info->SCpnt = NULL; 2384 res = res_hw_abort; 2385 } 2386 break; 2387 2388 default: 2389 break; 2390 } 2391 } else if (info->origSCpnt == SCpnt) { 2392 /* 2393 * The command will be executed next, but a command 2394 * is currently using the interface. This is similar to 2395 * being on the issue queue, except the busylun bit has 2396 * been set. 2397 */ 2398 info->origSCpnt = NULL; 2399 clear_bit(SCpnt->device->id * 8 + 2400 (u8)(SCpnt->device->lun & 0x7), info->busyluns); 2401 printk("waiting for execution "); 2402 res = res_success; 2403 } else 2404 printk("unknown "); 2405 2406 return res; 2407 } 2408 2409 /** 2410 * fas216_eh_abort - abort this command 2411 * @SCpnt: command to abort 2412 * 2413 * Abort this command. 2414 * Returns: FAILED if unable to abort 2415 * Notes: io_request_lock is taken, and irqs are disabled 2416 */ 2417 int fas216_eh_abort(struct scsi_cmnd *SCpnt) 2418 { 2419 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2420 int result = FAILED; 2421 2422 fas216_checkmagic(info); 2423 2424 info->stats.aborts += 1; 2425 2426 scmd_printk(KERN_WARNING, SCpnt, "abort command\n"); 2427 2428 print_debug_list(); 2429 fas216_dumpstate(info); 2430 2431 switch (fas216_find_command(info, SCpnt)) { 2432 /* 2433 * We found the command, and cleared it out. Either 2434 * the command is still known to be executing on the 2435 * target, or the busylun bit is not set. 2436 */ 2437 case res_success: 2438 scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt); 2439 result = SUCCESS; 2440 break; 2441 2442 /* 2443 * We need to reconnect to the target and send it an 2444 * ABORT or ABORT_TAG message. We can only do this 2445 * if the bus is free. 2446 */ 2447 case res_hw_abort: 2448 2449 /* 2450 * We are unable to abort the command for some reason. 2451 */ 2452 default: 2453 case res_failed: 2454 scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt); 2455 break; 2456 } 2457 2458 return result; 2459 } 2460 2461 /** 2462 * fas216_eh_device_reset - Reset the device associated with this command 2463 * @SCpnt: command specifing device to reset 2464 * 2465 * Reset the device associated with this command. 2466 * Returns: FAILED if unable to reset. 2467 * Notes: We won't be re-entered, so we'll only have one device 2468 * reset on the go at one time. 2469 */ 2470 int fas216_eh_device_reset(struct scsi_cmnd *SCpnt) 2471 { 2472 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2473 unsigned long flags; 2474 int i, res = FAILED, target = SCpnt->device->id; 2475 2476 fas216_log(info, LOG_ERROR, "device reset for target %d", target); 2477 2478 spin_lock_irqsave(&info->host_lock, flags); 2479 2480 do { 2481 /* 2482 * If we are currently connected to a device, and 2483 * it is the device we want to reset, there is 2484 * nothing we can do here. Chances are it is stuck, 2485 * and we need a bus reset. 2486 */ 2487 if (info->SCpnt && !info->scsi.disconnectable && 2488 info->SCpnt->device->id == SCpnt->device->id) 2489 break; 2490 2491 /* 2492 * We're going to be resetting this device. Remove 2493 * all pending commands from the driver. By doing 2494 * so, we guarantee that we won't touch the command 2495 * structures except to process the reset request. 2496 */ 2497 queue_remove_all_target(&info->queues.issue, target); 2498 queue_remove_all_target(&info->queues.disconnected, target); 2499 if (info->origSCpnt && info->origSCpnt->device->id == target) 2500 info->origSCpnt = NULL; 2501 if (info->reqSCpnt && info->reqSCpnt->device->id == target) 2502 info->reqSCpnt = NULL; 2503 for (i = 0; i < 8; i++) 2504 clear_bit(target * 8 + i, info->busyluns); 2505 2506 /* 2507 * Hijack this SCSI command structure to send 2508 * a bus device reset message to this device. 2509 */ 2510 SCpnt->host_scribble = (void *)fas216_devicereset_done; 2511 2512 info->rst_dev_status = 0; 2513 info->rstSCpnt = SCpnt; 2514 2515 if (info->scsi.phase == PHASE_IDLE) 2516 fas216_kick(info); 2517 2518 mod_timer(&info->eh_timer, jiffies + 30 * HZ); 2519 spin_unlock_irqrestore(&info->host_lock, flags); 2520 2521 /* 2522 * Wait up to 30 seconds for the reset to complete. 2523 */ 2524 wait_event(info->eh_wait, info->rst_dev_status); 2525 2526 del_timer_sync(&info->eh_timer); 2527 spin_lock_irqsave(&info->host_lock, flags); 2528 info->rstSCpnt = NULL; 2529 2530 if (info->rst_dev_status == 1) 2531 res = SUCCESS; 2532 } while (0); 2533 2534 SCpnt->host_scribble = NULL; 2535 spin_unlock_irqrestore(&info->host_lock, flags); 2536 2537 fas216_log(info, LOG_ERROR, "device reset complete: %s\n", 2538 res == SUCCESS ? "success" : "failed"); 2539 2540 return res; 2541 } 2542 2543 /** 2544 * fas216_eh_bus_reset - Reset the bus associated with the command 2545 * @SCpnt: command specifing bus to reset 2546 * 2547 * Reset the bus associated with the command. 2548 * Returns: FAILED if unable to reset. 2549 * Notes: Further commands are blocked. 2550 */ 2551 int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt) 2552 { 2553 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2554 unsigned long flags; 2555 struct scsi_device *SDpnt; 2556 2557 fas216_checkmagic(info); 2558 fas216_log(info, LOG_ERROR, "resetting bus"); 2559 2560 info->stats.bus_resets += 1; 2561 2562 spin_lock_irqsave(&info->host_lock, flags); 2563 2564 /* 2565 * Stop all activity on this interface. 2566 */ 2567 fas216_aborttransfer(info); 2568 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2569 2570 /* 2571 * Clear any pending interrupts. 2572 */ 2573 while (fas216_readb(info, REG_STAT) & STAT_INT) 2574 fas216_readb(info, REG_INST); 2575 2576 info->rst_bus_status = 0; 2577 2578 /* 2579 * For each attached hard-reset device, clear out 2580 * all command structures. Leave the running 2581 * command in place. 2582 */ 2583 shost_for_each_device(SDpnt, info->host) { 2584 int i; 2585 2586 if (SDpnt->soft_reset) 2587 continue; 2588 2589 queue_remove_all_target(&info->queues.issue, SDpnt->id); 2590 queue_remove_all_target(&info->queues.disconnected, SDpnt->id); 2591 if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id) 2592 info->origSCpnt = NULL; 2593 if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id) 2594 info->reqSCpnt = NULL; 2595 info->SCpnt = NULL; 2596 2597 for (i = 0; i < 8; i++) 2598 clear_bit(SDpnt->id * 8 + i, info->busyluns); 2599 } 2600 2601 info->scsi.phase = PHASE_IDLE; 2602 2603 /* 2604 * Reset the SCSI bus. Device cleanup happens in 2605 * the interrupt handler. 2606 */ 2607 fas216_cmd(info, CMD_RESETSCSI); 2608 2609 mod_timer(&info->eh_timer, jiffies + HZ); 2610 spin_unlock_irqrestore(&info->host_lock, flags); 2611 2612 /* 2613 * Wait one second for the interrupt. 2614 */ 2615 wait_event(info->eh_wait, info->rst_bus_status); 2616 del_timer_sync(&info->eh_timer); 2617 2618 fas216_log(info, LOG_ERROR, "bus reset complete: %s\n", 2619 info->rst_bus_status == 1 ? "success" : "failed"); 2620 2621 return info->rst_bus_status == 1 ? SUCCESS : FAILED; 2622 } 2623 2624 /** 2625 * fas216_init_chip - Initialise FAS216 state after reset 2626 * @info: state structure for interface 2627 * 2628 * Initialise FAS216 state after reset 2629 */ 2630 static void fas216_init_chip(FAS216_Info *info) 2631 { 2632 unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7; 2633 fas216_writeb(info, REG_CLKF, clock); 2634 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2635 fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]); 2636 fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); 2637 fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); 2638 fas216_writeb(info, REG_SOF, 0); 2639 fas216_writeb(info, REG_STP, info->scsi.async_stp); 2640 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2641 } 2642 2643 /** 2644 * fas216_eh_host_reset - Reset the host associated with this command 2645 * @SCpnt: command specifing host to reset 2646 * 2647 * Reset the host associated with this command. 2648 * Returns: FAILED if unable to reset. 2649 * Notes: io_request_lock is taken, and irqs are disabled 2650 */ 2651 int fas216_eh_host_reset(struct scsi_cmnd *SCpnt) 2652 { 2653 FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; 2654 2655 spin_lock_irq(info->host->host_lock); 2656 2657 fas216_checkmagic(info); 2658 2659 fas216_log(info, LOG_ERROR, "resetting host"); 2660 2661 /* 2662 * Reset the SCSI chip. 2663 */ 2664 fas216_cmd(info, CMD_RESETCHIP); 2665 2666 /* 2667 * Ugly ugly ugly! 2668 * We need to release the host_lock and enable 2669 * IRQs if we sleep, but we must relock and disable 2670 * IRQs after the sleep. 2671 */ 2672 spin_unlock_irq(info->host->host_lock); 2673 msleep(50 * 1000/100); 2674 spin_lock_irq(info->host->host_lock); 2675 2676 /* 2677 * Release the SCSI reset. 2678 */ 2679 fas216_cmd(info, CMD_NOP); 2680 2681 fas216_init_chip(info); 2682 2683 spin_unlock_irq(info->host->host_lock); 2684 return SUCCESS; 2685 } 2686 2687 #define TYPE_UNKNOWN 0 2688 #define TYPE_NCR53C90 1 2689 #define TYPE_NCR53C90A 2 2690 #define TYPE_NCR53C9x 3 2691 #define TYPE_Am53CF94 4 2692 #define TYPE_EmFAS216 5 2693 #define TYPE_QLFAS216 6 2694 2695 static char *chip_types[] = { 2696 "unknown", 2697 "NS NCR53C90", 2698 "NS NCR53C90A", 2699 "NS NCR53C9x", 2700 "AMD Am53CF94", 2701 "Emulex FAS216", 2702 "QLogic FAS216" 2703 }; 2704 2705 static int fas216_detect_type(FAS216_Info *info) 2706 { 2707 int family, rev; 2708 2709 /* 2710 * Reset the chip. 2711 */ 2712 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2713 udelay(50); 2714 fas216_writeb(info, REG_CMD, CMD_NOP); 2715 2716 /* 2717 * Check to see if control reg 2 is present. 2718 */ 2719 fas216_writeb(info, REG_CNTL3, 0); 2720 fas216_writeb(info, REG_CNTL2, CNTL2_S2FE); 2721 2722 /* 2723 * If we are unable to read back control reg 2 2724 * correctly, it is not present, and we have a 2725 * NCR53C90. 2726 */ 2727 if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE) 2728 return TYPE_NCR53C90; 2729 2730 /* 2731 * Now, check control register 3 2732 */ 2733 fas216_writeb(info, REG_CNTL2, 0); 2734 fas216_writeb(info, REG_CNTL3, 0); 2735 fas216_writeb(info, REG_CNTL3, 5); 2736 2737 /* 2738 * If we are unable to read the register back 2739 * correctly, we have a NCR53C90A 2740 */ 2741 if (fas216_readb(info, REG_CNTL3) != 5) 2742 return TYPE_NCR53C90A; 2743 2744 /* 2745 * Now read the ID from the chip. 2746 */ 2747 fas216_writeb(info, REG_CNTL3, 0); 2748 2749 fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK); 2750 fas216_writeb(info, REG_CNTL3, 0); 2751 2752 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2753 udelay(50); 2754 fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP); 2755 2756 fas216_writeb(info, REG_CNTL2, CNTL2_ENF); 2757 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2758 udelay(50); 2759 fas216_writeb(info, REG_CMD, CMD_NOP); 2760 2761 rev = fas216_readb(info, REG_ID); 2762 family = rev >> 3; 2763 rev &= 7; 2764 2765 switch (family) { 2766 case 0x01: 2767 if (rev == 4) 2768 return TYPE_Am53CF94; 2769 break; 2770 2771 case 0x02: 2772 switch (rev) { 2773 case 2: 2774 return TYPE_EmFAS216; 2775 case 3: 2776 return TYPE_QLFAS216; 2777 } 2778 break; 2779 2780 default: 2781 break; 2782 } 2783 printk("family %x rev %x\n", family, rev); 2784 return TYPE_NCR53C9x; 2785 } 2786 2787 /** 2788 * fas216_reset_state - Initialise driver internal state 2789 * @info: state to initialise 2790 * 2791 * Initialise driver internal state 2792 */ 2793 static void fas216_reset_state(FAS216_Info *info) 2794 { 2795 int i; 2796 2797 fas216_checkmagic(info); 2798 2799 fas216_bus_reset(info); 2800 2801 /* 2802 * Clear out all stale info in our state structure 2803 */ 2804 memset(info->busyluns, 0, sizeof(info->busyluns)); 2805 info->scsi.disconnectable = 0; 2806 info->scsi.aborting = 0; 2807 2808 for (i = 0; i < 8; i++) { 2809 info->device[i].parity_enabled = 0; 2810 info->device[i].parity_check = 1; 2811 } 2812 2813 /* 2814 * Drain all commands on disconnected queue 2815 */ 2816 while (queue_remove(&info->queues.disconnected) != NULL); 2817 2818 /* 2819 * Remove executing commands. 2820 */ 2821 info->SCpnt = NULL; 2822 info->reqSCpnt = NULL; 2823 info->rstSCpnt = NULL; 2824 info->origSCpnt = NULL; 2825 } 2826 2827 /** 2828 * fas216_init - initialise FAS/NCR/AMD SCSI structures. 2829 * @host: a driver-specific filled-out structure 2830 * 2831 * Initialise FAS/NCR/AMD SCSI structures. 2832 * Returns: 0 on success 2833 */ 2834 int fas216_init(struct Scsi_Host *host) 2835 { 2836 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2837 2838 info->magic_start = MAGIC; 2839 info->magic_end = MAGIC; 2840 info->host = host; 2841 info->scsi.cfg[0] = host->this_id | CNTL1_PERE; 2842 info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE; 2843 info->scsi.cfg[2] = info->ifcfg.cntl3 | 2844 CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM; 2845 info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod); 2846 2847 info->rst_dev_status = -1; 2848 info->rst_bus_status = -1; 2849 init_waitqueue_head(&info->eh_wait); 2850 init_timer(&info->eh_timer); 2851 info->eh_timer.data = (unsigned long)info; 2852 info->eh_timer.function = fas216_eh_timer; 2853 2854 spin_lock_init(&info->host_lock); 2855 2856 memset(&info->stats, 0, sizeof(info->stats)); 2857 2858 msgqueue_initialise(&info->scsi.msgs); 2859 2860 if (!queue_initialise(&info->queues.issue)) 2861 return -ENOMEM; 2862 2863 if (!queue_initialise(&info->queues.disconnected)) { 2864 queue_free(&info->queues.issue); 2865 return -ENOMEM; 2866 } 2867 2868 return 0; 2869 } 2870 2871 /** 2872 * fas216_add - initialise FAS/NCR/AMD SCSI ic. 2873 * @host: a driver-specific filled-out structure 2874 * @dev: parent device 2875 * 2876 * Initialise FAS/NCR/AMD SCSI ic. 2877 * Returns: 0 on success 2878 */ 2879 int fas216_add(struct Scsi_Host *host, struct device *dev) 2880 { 2881 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2882 int type, ret; 2883 2884 if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) { 2885 printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n", 2886 info->ifcfg.clockrate); 2887 return -EINVAL; 2888 } 2889 2890 fas216_reset_state(info); 2891 type = fas216_detect_type(info); 2892 info->scsi.type = chip_types[type]; 2893 2894 udelay(300); 2895 2896 /* 2897 * Initialise the chip correctly. 2898 */ 2899 fas216_init_chip(info); 2900 2901 /* 2902 * Reset the SCSI bus. We don't want to see 2903 * the resulting reset interrupt, so mask it 2904 * out. 2905 */ 2906 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR); 2907 fas216_writeb(info, REG_CMD, CMD_RESETSCSI); 2908 2909 /* 2910 * scsi standard says wait 250ms 2911 */ 2912 spin_unlock_irq(info->host->host_lock); 2913 msleep(100*1000/100); 2914 spin_lock_irq(info->host->host_lock); 2915 2916 fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); 2917 fas216_readb(info, REG_INST); 2918 2919 fas216_checkmagic(info); 2920 2921 ret = scsi_add_host(host, dev); 2922 if (ret) 2923 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2924 else 2925 scsi_scan_host(host); 2926 2927 return ret; 2928 } 2929 2930 void fas216_remove(struct Scsi_Host *host) 2931 { 2932 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2933 2934 fas216_checkmagic(info); 2935 scsi_remove_host(host); 2936 2937 fas216_writeb(info, REG_CMD, CMD_RESETCHIP); 2938 scsi_host_put(host); 2939 } 2940 2941 /** 2942 * fas216_release - release all resources for FAS/NCR/AMD SCSI ic. 2943 * @host: a driver-specific filled-out structure 2944 * 2945 * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic. 2946 */ 2947 void fas216_release(struct Scsi_Host *host) 2948 { 2949 FAS216_Info *info = (FAS216_Info *)host->hostdata; 2950 2951 queue_free(&info->queues.disconnected); 2952 queue_free(&info->queues.issue); 2953 } 2954 2955 void fas216_print_host(FAS216_Info *info, struct seq_file *m) 2956 { 2957 seq_printf(m, 2958 "\n" 2959 "Chip : %s\n" 2960 " Address: 0x%p\n" 2961 " IRQ : %d\n" 2962 " DMA : %d\n", 2963 info->scsi.type, info->scsi.io_base, 2964 info->scsi.irq, info->scsi.dma); 2965 } 2966 2967 void fas216_print_stats(FAS216_Info *info, struct seq_file *m) 2968 { 2969 seq_printf(m, "\n" 2970 "Command Statistics:\n" 2971 " Queued : %u\n" 2972 " Issued : %u\n" 2973 " Completed : %u\n" 2974 " Reads : %u\n" 2975 " Writes : %u\n" 2976 " Others : %u\n" 2977 " Disconnects: %u\n" 2978 " Aborts : %u\n" 2979 " Bus resets : %u\n" 2980 " Host resets: %u\n", 2981 info->stats.queues, info->stats.removes, 2982 info->stats.fins, info->stats.reads, 2983 info->stats.writes, info->stats.miscs, 2984 info->stats.disconnects, info->stats.aborts, 2985 info->stats.bus_resets, info->stats.host_resets); 2986 } 2987 2988 void fas216_print_devices(FAS216_Info *info, struct seq_file *m) 2989 { 2990 struct fas216_device *dev; 2991 struct scsi_device *scd; 2992 2993 seq_puts(m, "Device/Lun TaggedQ Parity Sync\n"); 2994 2995 shost_for_each_device(scd, info->host) { 2996 dev = &info->device[scd->id]; 2997 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 2998 if (scd->tagged_supported) 2999 seq_printf(m, "%3sabled(%3d) ", 3000 scd->simple_tags ? "en" : "dis", 3001 scd->current_tag); 3002 else 3003 seq_puts(m, "unsupported "); 3004 3005 seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis"); 3006 3007 if (dev->sof) 3008 seq_printf(m, "offset %d, %d ns\n", 3009 dev->sof, dev->period * 4); 3010 else 3011 seq_puts(m, "async\n"); 3012 } 3013 } 3014 3015 EXPORT_SYMBOL(fas216_init); 3016 EXPORT_SYMBOL(fas216_add); 3017 EXPORT_SYMBOL(fas216_queue_command); 3018 EXPORT_SYMBOL(fas216_noqueue_command); 3019 EXPORT_SYMBOL(fas216_intr); 3020 EXPORT_SYMBOL(fas216_remove); 3021 EXPORT_SYMBOL(fas216_release); 3022 EXPORT_SYMBOL(fas216_eh_abort); 3023 EXPORT_SYMBOL(fas216_eh_device_reset); 3024 EXPORT_SYMBOL(fas216_eh_bus_reset); 3025 EXPORT_SYMBOL(fas216_eh_host_reset); 3026 EXPORT_SYMBOL(fas216_print_host); 3027 EXPORT_SYMBOL(fas216_print_stats); 3028 EXPORT_SYMBOL(fas216_print_devices); 3029 3030 MODULE_AUTHOR("Russell King"); 3031 MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core"); 3032 MODULE_LICENSE("GPL"); 3033